Don’t know what VMware VMotion is? VMotion allows you to easily move one virtual machine to another VMware ESX host that is connected to the same storage mechanism (presumably SAN) with no downtime. Looks promising Image may be NSFW.
Clik here to view.
Image may be NSFW.
Clik here to view.
Clik here to view.
Image courtesy of VMware
Dell has a demonstration using Microsoft SQL Server where they move the live SQL Server from one blade to another with no outage:
